Camera shutter



n Sept. 21 1926.

H. GESELL EI' AL GAMER. SHUTTER Grigia, Filed Oct. 1. 1923 Paten-tedSept. 21, 1926.

UNITEDy sTATEs PATENT oFElIcE.

HANS GEBELI.. AND EEIIBICH BBUIS, 0l' IUN'IGH, GERMANY, ASSIGNOBS FmFRIEDRICH Dm PMCIBONSIECHLNIK AND z IUN'ICH, (im.

TOTHE U, OF

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Application Mei! ctober 1, 1823, Serial lo. 685,01, Andria GermanyOctober 13, 1982. Renewed Ilovember The present invention relates tocamera shutters and has for its object to provide means for regulatingtheexposure time of such shutters in a very simple yet extremelyaccurate and sensitive manner without step or break over a very extendedrange of adjustment. The above and various other 1mprovements will behereinafter fully described and claimed.

In order that this our invention may be more readily understoodreference is made to the accompanying sheet of drawings, which shov'show t is invention may be carried into practical effect. All parts ofthe shutter not standing in direct relation to the object of theinvention have not been shown but may be of well known construction.

Fig. 1 shows the internal arrangement of the retarding l mechanism, thecover plate and the parts above the cover plate removed.

Y Fig. 2 shows the parts on top of the cover late.

P Fig. 3 is a sectional view through the mechanism at right angles toFigures 1 and 2.

The spring motor or master member 1 that furnishes the wer is wound by asetting lever 2. It is ocated in the annular re` cess of the shutterhousing 3 which is closed by the cover 4. The arrow on Figure 1indicates the direction of movement of the master member 1 when tripped.A spring 10 tends to swing a retarding lever 8 on a pivot 9, making anose 7 of the retarding lever enter into a recess 5 which has been cutinto the circumference of the master member 1. The retarding lever 8 isformed on the end 11 with gear teeth. In engagement with this gearsector are teeth cut onto one end of a lever 12 which is turnablymounted on a= stud 13. The other end of the lever 12 provides a bearingfor a pin 14, to which two gears 15 and 16 are rigidly connected 'one oneach side of the lever 12. A gear 17 in mesh with gear 15 is fastened toan escape 18, both turning freely on the stud 13. Workin together withthe escape wheel 18 there is ocated anpanchor 19 pivoted on a stud 20,which is carried by a lever 21. Lever 21 is held by a 23 up against apin of the shutter blade actuating gear wheel 24, lever 12, gear 17 andescape wheel 18, carriestwo pins 28 and 29 which are located in thepat-h of a pin 30 fastened in the body of the internal gear wheel 24.4

The action of the mechanism is as follows:

After setting the motor spring through pressure on the setting lever 2the nose 7 of the retarding lever 8 influenced by the spring 10 entersinto the recess 5 of the master member 1 a certain distance which may bedescreased for part of the regulatin range by the setting of theindicating dies 27. The lever 8 swlngs at first the internal gear 24through lever 12 because the bodily movement of the whole planetary gearsystem offers the least resistance. This moveof exposure by the contactof pin 30 with pin 29. Thereafter the gear 16 rolls'oif on the teeth ofthe internal gear 24 until it runs up against the end of the slot 32.During this period of setting the anchor 19 is out of engagement withthe escape wheel 18 allowing thus a very fast return although only aweak spring 10 is employed. y

1When releasing the motor member 1 the lever 8 remains stationary untilthe shoulder 6 of the recess 5 strikes against the nose 'i'- The momentof Contact should be chosen at the time when the blades of the shutterwhich are actuated by a connecting rod from the motor member 1 in a wellknown manner have been opened the furthest, in order that the lever 8together with the system of planetary gearing may interpose at thispeopposite side of the '27 still further,

riod the retardation 'of varying magnitude. After the nose 7 of thelever 8 has been pushed out of the recess 5, the motor member 1 is freeto move and the closing of the shutter blades is quickly accomplished.

The movement of the lever 8 turns lever 12. Located thereon the gears 15and 16 swing 'around and actuate either the internal gear 24, the gear16 moving it around bodily, or, if this gear is prevented from. turningby the stop 28 on the regulating disc 27, the gear 16 rolls off on theinternal gear 24 imparting thus through gears 15 and 17 a relativelyfast movement to the escape wheel 18, which is retarded by the anchor 19not held out of engagement during the exposure period by the shutteractuating ring 22. A Instead of an escape wheel and anchor any otherretarding means may be used.

The regulatlng disc 27 with corresponding graduations on topf. is set tothe time of exposure wanted. In the accompanying drawings the mechanismis shown set for the longest possible time of exposure, partly run oli.In this case the shoulder 25 of the outer recess on the internal. gear24 rests against pin 26 and the pin 28 of the regulating disc 27, which-latter is held against movement by a friction spring, arrests pin 30and makes any movement of the internal gear 24 impossible. Thereforegear 16 has to roll oli on the internal gear until nose 7 has beenforced out of the Way.

In order to shorten the time of exposure the regulating disc 27 has tobe turned so that 1n 28 moves away from pin 30, allow ing t us at firsta part movement of the internal gear 24, which is succeeded after thecontact of the pin 28 with the pin 30 by the regular rolling oil of thegear 16. en the regulating disc 27 has been turned so far that pinv 30does not reach pin 28 any more, the second pin 29 lays up against the xpin 30. When turning disc 27 further, the shoulder 25 of the internalgear is removed from the pin 26 and the nose 7 of the lever 8 does notenter to the fullv extent into the recess 5. In these positions norolling oif of gear 16 takes place. Consequently the amount of movementof the escape wheelv 18 grows very slight. When turning the regulatingdisc the internal gear 24 and the lever 8 move through an increasinglysmaller angle deereasing'thus gradually the time of exposure. Finallythe regulating disc 27 may be turned so far that the nose 7 .of thelever 8 does not enter into the recess 5 of the motor member 1,eliminating in this way the influence of the retarding device completelyand causing the shortest time of e osure.

f aving now full explained our invention we do not wish to understood aslimiting ourselves to the exact details of construction as obviouslymany modifications will occur to a person skilled in the art.

What we claim is 1. In a camera shutter the combination with a shuttermechanism and a. motor member for operating said shutter mechanism of aretarding device geared to one of said elements and embodying a systemof planetary gearing.

2. In a camera shutter the combination with a shutter mechanism andoperating mechanism therefor embodying a master member of a controllablestop for the master member and lanetary gearing and a retarding deviceor the latter member in connection and moving with said controllablestop.

3. In a camera shutter the combination with a shutter mechanism andoperating mechanism therefor of retarding means consisting of planetarygearing geared to one of said elements and means for controlling themovement of said gearing.

4. In a photographic shutter, the combination with blade mechanismincluding a blade actuating ring, a master member for operating saidring and a retarding device operated by the master member and embodyingan escapement wheel and an anchor cooperating therewith, of means on theblade ring adapted to control the relation between the anchor and theescapement wheel.

5. In a photo raphic shutter, the combination with blae mechanismincludin a blade actuating ring, a master`member or operating said ringand a retarding device operated by the master member and embodying anescapement wheel and an anchor cooperating therewith, of means on theblade ring adapted to throw out the anchor while the blades are beingopened by the master member and to restore its cooperation with theescapementwheel while the blades are being closed.

6. In a photographic shutter, the combination with blade mechanismincluding a blade actuating ring, a master member for operating saidring and a retarding device operated by the master member and embodyingan escapement wheel and an anchor cooperating therewith, of aswinging-member adapted to carry the anchor into and out of cooperationwith .the escapement wheel, a sprin for movingl the same intocooperation and means on t e blade actuating ring adapted to engage theswinging bodying an escapement wheel and an anchor cooperatingtherewith, of a segment lever actuated by the master member, planetarygearing actuatedby 'the segment lever to drive the esca ment wheel anda, re ating device a apted to establish di event' points at which theplanetary gearing is picked up by the `segment lever.

8. In' a photographic shutter, the combination with blade mechanism, amaster member for operating the same and a. retarding device for themaster member embodying an escapement wheel and an anchor cooperatingtherewith, of a segment lever 15 actuated by the master member, atoothed swinging member actuatedby the segment lever, a gear on theescapement wheel, a

planetary gear on the swin ing member for driving said last mentionegear, a second planetary gear on a swinging member, an internal gearcooperating with the latter and having a limited movement with theplanetary system and a regulating device for limiting the movement oftheinternal ear. g In testimony whereof we hereunto -aix our signatures.

HANS GESELL HEINRICH BRUNS.

